Improvement in centrifugal pumps



in'td' StainesV @met @time Letters Patent No. 95,749, dated October 12, 1869.

IMPROVEMENT IN CETRIFUG-AL PUMPS.

The Schedule referred to-in these Letten Patent an'd making part of the lame.

Be it known that I, STEPHEN P. THAYER, of Baldwinsville,- in the county of Onondaga, and State of New York, have invented a new and useful Improvement on a Centrifugal Pump; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification.

Figure 1 is a top view of the pump-case.

Figure 2, aside elevation of the same.

Figure 3, a bottom view of the centrifugal wheel, which forces up the water.

4Figure 4,-a side view of the same.

Like letters designate corresponding parts in all of the iignes.

The case is made of any suitable or usual form and construction, except that there are two tangential dis-I charge-openings in opposite sides of the periphery, as shown in figs. 1 and 2, each formed, as usual, for the attachment of an elevating-pipe. The pipesmay unite in one, or continue separately to the -place or places of discharge.l

There is a special advantage in the employment of two discharge-openings or outlets, applied to a tangential or peripheral-discharge centrifugal pump, beyond a mere duplication of parts, since the wings or buckets of the centrifugal wheel supply the water to the periphery faster than one educton-opening can conduct it away, and by giving a freer vent to thewater, as I do, I raise a larger percentage of water with a given power. Another advantage of the double discharge is that the resistance of the waterl is balanced on the two sides, so that there is an even wear of the shaft-bearings; whereas, with the single discharge, the bearings wear much more' rapidly on.the side opposite to the discharge.

There might be three or four discharge-openings, but probably with little practical advantage, and with increased cost of construction. Hence I believe the double discharge to be best, all things considered.

`The improved centrifugal wheel has wings K K,

extending from the shaft or hub to the periphery, in

radial, or nearly radial directions, and either straight The essential feature of novelty consists in the 'inclined position of these wings forward, at the lower edge, or toward that face of the wheel through which the water enters.

This inclination is only essential at the inner ends, or inthe portions opposite to the induction-opening in the face of the pump, and it may continue to the periphery, or not, as desired or most convenient `in construction. f

The object of this forward inclinationof the wings is to draw the water into the pump thereby, without depending solely on its centrifugal action, so as to `supply water positively to the wheel as fast as the outer portions of the wings drive it forward.

The degree of inclination may be about as represented inthe drawings, or somewhat more will give a better effect.

With these wings thus inclined forward, a larger induction-opening can be made in the case without diminishing the centrifugal power of the pump, and therebyV a freer admission of water is gained.

As all of the wings, extended into the hubor shaft of the wheel, occupy ai considerable part ofthe central space of the wheel, I. find it preferable to narrow a portion of them, say each alternate wing, inward from the outer circumference of the induction-opening of the case to the hub, as shown in iig. 3. l

What I claim as my invention, and desire to secure by Letters Patent, isl The peripheral-discharge centrifugal pump, having wings K K, inclined forward toward the inductionopening of the pump, Substantially as and for the purpose herein specified.

Also, in combination with the centrifugal wheel, constructed as above described, the two tangential discharge-openings in the oase, substantially as and for the purpose herein set forth.

STEPHEN P, THAYER. v

Witnesses:

WM. M. B EAUGHAMP, N. M. WHITE. 

